private int cur_output_row; /* next row# to write to virtual array */ public bmp_dest_struct(jpeg_decompress_struct cinfo, bool is_os2) { this.cinfo = cinfo; this.is_os2 = is_os2; if (cinfo.Out_color_space == J_COLOR_SPACE.JCS_GRAYSCALE) { m_putGrayRows = true; } else if (cinfo.Out_color_space == J_COLOR_SPACE.JCS_RGB) { if (cinfo.Quantize_colors) m_putGrayRows = true; else m_putGrayRows = false; } else { cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_COLORSPACE); } /* Calculate output image dimensions so we can allocate space */ cinfo.jpeg_calc_output_dimensions(); /* Determine width of rows in the BMP file (padded to 4-byte boundary). */ row_width = cinfo.Output_width * cinfo.Output_components; data_width = row_width; while ((row_width & 3) != 0) row_width++; pad_bytes = row_width - data_width; /* Allocate space for inversion array, prepare for write pass */ whole_image = jpeg_common_struct.CreateSamplesArray(row_width, cinfo.Output_height); whole_image.ErrorProcessor = cinfo; cur_output_row = 0; if (cinfo.Progress != null) { cdjpeg_progress_mgr progress = cinfo.Progress as cdjpeg_progress_mgr; if (progress != null) { /* count file input as separate pass */ progress.total_extra_passes++; } } /* Create decompressor output buffer. */ buffer = jpeg_common_struct.AllocJpegSamples(row_width, 1); buffer_height = 1; }
/// <summary> /// Read next byte /// </summary> static int jpeg_getc(jpeg_decompress_struct decompressor) { int v; if (!decompressor.Src.GetByte(out v)) decompressor.ERREXIT(J_MESSAGE_CODE.JERR_CANT_SUSPEND); return v; }
private static void decompress(Stream input, DecompressOptions options, Stream output) { Debug.Assert(input != null); Debug.Assert(options != null); Debug.Assert(output != null); /* Initialize the JPEG decompression object with default error handling. */ jpeg_decompress_struct cinfo = new jpeg_decompress_struct(new cd_jpeg_error_mgr()); /* Insert custom marker processor for COM and APP12. * APP12 is used by some digital camera makers for textual info, * so we provide the ability to display it as text. * If you like, additional APPn marker types can be selected for display, * but don't try to override APP0 or APP14 this way (see libjpeg.doc). */ cinfo.jpeg_set_marker_processor((int)JPEG_MARKER.COM, new jpeg_decompress_struct.jpeg_marker_parser_method(printTextMarker)); cinfo.jpeg_set_marker_processor((int)JPEG_MARKER.APP0 + 12, printTextMarker); /* Specify data source for decompression */ cinfo.jpeg_stdio_src(input); /* Read file header, set default decompression parameters */ cinfo.jpeg_read_header(true); applyOptions(cinfo, options); /* Initialize the output module now to let it override any crucial * option settings (for instance, GIF wants to force color quantization). */ djpeg_dest_struct dest_mgr = null; switch (options.OutputFormat) { case IMAGE_FORMATS.FMT_BMP: dest_mgr = new bmp_dest_struct(cinfo, false); break; case IMAGE_FORMATS.FMT_OS2: dest_mgr = new bmp_dest_struct(cinfo, true); break; default: cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_UNSUPPORTED_FORMAT); break; } dest_mgr.output_file = output; /* Start decompressor */ cinfo.jpeg_start_decompress(); /* Write output file header */ dest_mgr.start_output(); /* Process data */ while (cinfo.Output_scanline < cinfo.Output_height) { int num_scanlines = cinfo.jpeg_read_scanlines(dest_mgr.buffer, dest_mgr.buffer_height); dest_mgr.put_pixel_rows(num_scanlines); } /* Finish decompression and release memory. * I must do it in this order because output module has allocated memory * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory. */ dest_mgr.finish_output(); cinfo.jpeg_finish_decompress(); /* All done. */ if (cinfo.Err.Num_warnings != 0) Console.WriteLine("Corrupt-data warning count is not zero"); }
static string outfilename; /* for -outfile switch */ public static void Main(string[] args) { progname = Path.GetFileName(Environment.GetCommandLineArgs()[0]); /* Initialize the JPEG decompression object with default error handling. */ cd_jpeg_error_mgr err = new cd_jpeg_error_mgr(); jpeg_decompress_struct cinfo = new jpeg_decompress_struct(err); /* Insert custom marker processor for COM and APP12. * APP12 is used by some digital camera makers for textual info, * so we provide the ability to display it as text. * If you like, additional APPn marker types can be selected for display, * but don't try to override APP0 or APP14 this way (see libjpeg.doc). */ cinfo.jpeg_set_marker_processor((int)JPEG_MARKER.COM, new jpeg_decompress_struct.jpeg_marker_parser_method(print_text_marker)); cinfo.jpeg_set_marker_processor((int)JPEG_MARKER.APP0 + 12, print_text_marker); /* Scan command line to find file names. */ /* It is convenient to use just one switch-parsing routine, but the switch * values read here are ignored; we will rescan the switches after opening * the input file. * (Exception: tracing level set here controls verbosity for COM markers * found during jpeg_read_header...) */ int file_index; if (!parse_switches(cinfo, args, false, out file_index)) { usage(); return; } /* Must have either -outfile switch or explicit output file name */ if (outfilename == null) { // file_index should point to input file if (file_index != args.Length - 2) { Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname)); usage(); return; } // output file comes right after input one outfilename = args[file_index + 1]; } else { // file_index should point to input file if (file_index != args.Length - 1) { Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname)); usage(); return; } } /* Open the input file. */ FileStream input_file = null; if (file_index < args.Length) { try { input_file = new FileStream(args[file_index], FileMode.Open); } catch (Exception e) { Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index])); Console.WriteLine(e.Message); return; } } else { Console.WriteLine(string.Format("{0}: sorry, can't read file from console")); return; } /* Open the output file. */ FileStream output_file = null; if (outfilename != null) { try { output_file = new FileStream(outfilename, FileMode.Create); } catch (Exception e) { Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index])); Console.WriteLine(e.Message); return; } } else { Console.WriteLine(string.Format("{0}: sorry, can't write file to console")); return; } /* Specify data source for decompression */ cinfo.jpeg_stdio_src(input_file); /* Read file header, set default decompression parameters */ cinfo.jpeg_read_header(true); /* Adjust default decompression parameters by re-parsing the options */ parse_switches(cinfo, args, true, out file_index); /* Initialize the output module now to let it override any crucial * option settings (for instance, GIF wants to force color quantization). */ djpeg_dest_struct dest_mgr = null; switch (requested_fmt) { case IMAGE_FORMATS.FMT_BMP: dest_mgr = new bmp_dest_struct(cinfo, false); break; case IMAGE_FORMATS.FMT_OS2: dest_mgr = new bmp_dest_struct(cinfo, true); break; default: cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_UNSUPPORTED_FORMAT); break; } dest_mgr.output_file = output_file; /* Start decompressor */ cinfo.jpeg_start_decompress(); /* Write output file header */ dest_mgr.start_output(); /* Process data */ while (cinfo.Output_scanline < cinfo.Output_height) { int num_scanlines = cinfo.jpeg_read_scanlines(dest_mgr.buffer, dest_mgr.buffer_height); dest_mgr.put_pixel_rows(num_scanlines); } /* Finish decompression and release memory. * I must do it in this order because output module has allocated memory * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory. */ dest_mgr.finish_output(); cinfo.jpeg_finish_decompress(); /* Close files, if we opened them */ input_file.Close(); input_file.Dispose(); output_file.Close(); output_file.Dispose(); /* All done. */ if (cinfo.Err.Num_warnings != 0) Console.WriteLine("Corrupt-data warning count is not zero"); }